Oh trust me, if the review was in the hands of the Umpire, they would both be overjoyed. Why can't an Umpire voluntarily consult the tech when in doubt. If the umpire has to make a decision when in doubt, without, the option of consulting tech which is available, you are in that situation asking him to guess. Thats when errors happen. The tech is there, and if the umpire has some doubt why not consult the tech before going making the decision. Instead first 'guess' and then have it challenged is the wrong way around.